making an intent??

Hi all,

Im modelling this shackle at work so we have a techy drawing of it. I am pretty sure it can be done, somehow?? but can I make the "indent" along the top of the shackle in my model? ive tried split lines / projected curve to cut it out but nothing seems to work. its intended on the top side and pushed out on the inside if that makes sense?

http://www.bainbridgemarine.co.uk/Item.aspx?Item=PRD-900105&PartNo=A517

Many thanks,

Andy

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